You might notice something different about the lineup of "Shark Tank" moguls in this teaser for the show's soon-to-begin fifth season.The two female Sharks, Barbara Corcoran and Lori Greiner, will be bidding against one another for the first time in Season 5. Both of them seem to relish the added competition, as you can see in the clip -- which is running exclusively on Zap2it.The two-minute teaser also gives a glimpse at some of the entrepreneurs vying for startup money this season, and some of the lofty figures -- $600,000, $800,000, $4 million -- the Sharks say they're willing to offer for a stake in the businesses. RELATED: 25 memorable pop-culture sharksAll that, plus Robert Herjavec running an inflatable obstacle course -- what's not to like?Season 5 of "Shark Tank" premieres at 9 p.m. ET Friday, Sept. 20 -- and starting Sunday (Sept. 8), you can catch "Shark Tank Week," with a repeat episode...